Question

Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100 W incandescent bulb uses only 23.0 W of power. The compact bulb lasts 1.00×104 hours, on the average, and costs $ 12.0 , whereas the incandescent bulb costs only 73.0 ¢, but lasts just 750 hours. The study assumed that electricity cost 9.00 ¢ per kWhand that the bulbs were on for 4.0 h per day. 1. What is the total cost (including the price of the bulbs) to run incandescent bulbs for 3.0 years? 2. What is the total cost (including the price of the bulbs) to run compact fluorescent bulbs for 3.0 years? 3. How much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb? What is the resistance of a "100 W" fluorescent bulb? (Remember, it actually uses only 23 W of power and operates across 120 V.)

          Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only
23.0 W of power. The compact bulb lasts
1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs
only 73.0 ¢, but lasts just 750 hours. The study assumed that
electricity cost 9.00 ¢ per kWhand that the bulbs were on for
4.0 h per day.
1. What is the total cost (including the price of the
bulbs) to run incandescent bulbs for 3.0 years?
2. What is the total cost (including the price of the
bulbs) to run compact fluorescent bulbs for 3.0 years?
3. How much do you save over 3.0 years if you use a compact
fluorescent bulb instead of an incandescent bulb?
What is the resistance of a "100 W" fluorescent bulb?
(Remember, it actually uses only 23 W of power and
operates across 120 V.)

Added by John K.

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